# Microsoft Agent Framework vs AI SDK

> AI SDK scores 89.8 (AA) to Microsoft Agent Framework's 79.4 (A) for agent frameworks. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/microsoft-agent-framework-vs-vercel-ai-sdk
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- Site index for agents: https://www.anchorterminal.com/llms.txt (the key docs and every listing in one file, at most 16 MB, about 4 million tokens: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key)
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- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)
- Updated: 2026-11-07

AI SDK scores 89.8 (AA) on agent readiness against Microsoft Agent Framework's 79.4 (A), and leads in 5 of 7 scored categories. Both do agent frameworks.

- Microsoft Agent Framework: grade A, 79.4/100, rank #18 of 1510. Markdown https://www.anchorterminal.com/tools/microsoft-agent-framework.md · JSON https://www.anchorterminal.com/api/v1/tools/microsoft-agent-framework.json
- AI SDK: grade AA, 89.8/100, rank #1 of 1510. Markdown https://www.anchorterminal.com/tools/vercel-ai-sdk.md · JSON https://www.anchorterminal.com/api/v1/tools/vercel-ai-sdk.json
- Best agent frameworks and SDKs: https://www.anchorterminal.com/best/frameworks/index.md
- All 171 frameworks comparisons: https://www.anchorterminal.com/compare/frameworks/index.md

## Which one, for what

### Microsoft Agent Framework (A)

Good for: Teams on Azure or .NET, and for teams moving off AutoGen or Semantic Kernel, that want MCP, approval, checkpointed workflows and OpenTelemetry in one SDK.

Also in its favour:
- No key needed to call it
- Free to start without a card

Watch for: Changes marked [BREAKING] shipped in minor releases of released packages, including agent-framework-core in 1.22.0 on 15 October and 1.23.0 on 22 October 2026

### AI SDK (AA)

Good for: TypeScript teams building agents and chat UIs who want one API across many providers and a short path to MCP.

Ahead on:
- Reliability, 93 against 78
- Schema & documentation, 100 against 95
- Agent ergonomics, 95 against 87
- Maintenance & community, 97 against 91

Also in its favour:
- No incidents deducted, where Microsoft Agent Framework loses 5 points for them

Watch for: TypeScript only, and `ai` 7.x needs Node 22 or newer


## Why the edge

### Reliability: AI SDK +15

- Microsoft Agent Framework (78): Read with the local-software lines. Official packages on PyPI (Requires-Python >=3.10 in the repository, though 1.24.0 makes Python 3.11 the supported baseline and says the next release drops 3.10) and NuGet (net8.0 to net10.0, netstandard2.0, net472) (20). Of the 15 most recent .NET build and test runs on 1 November 2026, 10 passed, 2 were cancelled and 4 wait for approval on a pull request, with none failed, and the scheduled runs on main passed on 31 October and 1 November (25). 610 open issues and 229 open pull requests on 1 November, up from 575 and 201 on 8 October. Closures and bug labels weren't re-counted (10). The Python changelog follows Keep a Changelog and states semantic versioning, and marks breaking changes, but they keep shipping in minor releases of released packages, such as agent-framework-core in 1.22.0 on 15 October and 1.23.0 on 22 October 2026 (8). Python 1.24.0 and .NET 1.27.0, with the root and core packages classed 5 - Production/Stable (15).
- AI SDK (93): Official npm packages, with `ai` 7.x requiring Node 22 or newer (20). A public CI workflow with lint, type checks, unit tests, Node-version tests, MCP tests on Windows and e2e tests runs on every push to main, and the newest completed CI runs on main passed on 6 November (25). 1,517 open issues and pull requests on 6 November from GitHub's API, with 1,059 issues opened in the 90 days to 3 November; 47 of the 50 newest had a comment and 32 were closed (18). A written versioning page with breaking changes only in majors, experimental_ prefixes for unstable APIs and a migration guide per major (15). 7.0.163 (15). 20+25+18+15+15 = 93, up from 73 on 6 October, when GitHub couldn't be read.

### Agent ergonomics: AI SDK +8

- Microsoft Agent Framework (87): The documented Python agent with one MCP server is about 12 lines with `MCPStdioTool` from the core package, and `allowed_tools`, `load_tools` and progressive disclosure limit what reaches the model (25). The function loop stops at 40 iterations by default with a `max_function_calls` option, and compaction has its own docs page (20). A typed exception hierarchy, and the loop stops after three consecutive tool errors by default. We didn't find MCP failures documented (16). Workflows resume from checkpoints and sessions serialise, but we found no retry setting for model calls in the core client (14). An agent needs a client and instructions. Python and .NET are stable, Go is in preview, and the quickstarts assume a Microsoft Foundry project (12).
- AI SDK (95): An MCP client in a few lines with createMCPClient and client.tools(), and tool search with deferLoading keeps unused tool definitions out of the prompt (25). stopWhen with a default of 20 steps, and prepareStep to trim messages, switch models or limit active tools per step (20). 38 typed errors with isInstance guards, and MCP results with isError go back to the model (20). maxRetries on model calls, opt-in retries for transient MCP failures only, and WorkflowAgent for durable steps with automatic retries (20). Few required parameters, but TypeScript only, and a string model ID needs an AI Gateway key unless a default provider is set (10).

### Maintenance & community: AI SDK +6

- Microsoft Agent Framework (91): Python 1.24.0 and .NET 1.27.0, both tagged on 2026-10-30 (30). 22 release tags in the 90 days to 1 November, 11 Python and 11 .NET (20). 610 open issues and 229 open pull requests on 1 November, and triage, labelling and stale-ping workflows run on new issues. We couldn't see reply times (17). Python and .NET packages are current, and Go is a public preview line with v0.2.1 tagged on 27 October 2026 (15). CI, CodeQL and Dependabot run, though two of four Dependabot update runs failed on 8 October, per the 8 October check, not re-read on 1 November (9).
- AI SDK (97): 7.0.163 on 2026-11-05 (30). 226 stable npm releases of `ai` across the 7.x, 6.x and 5.x lines in the 90 days to 6 November, 70 of them since 6 October (20). 47 of the 50 newest issues commented and 32 closed, with triage automation and backport workflows (22). `ai` and the provider packages are current, and 6.x and 5.x still get patches (15). Dependabot configured and CI passing on main (10). 30+20+22+15+10 = 97.

### Schema & documentation: AI SDK +5

- Microsoft Agent Framework (95): Typed in both languages, with py.typed markers and API references for Python and .NET on Microsoft Learn (25). Learn returns each docs page as Markdown when asked with an Accept header. No llms.txt was found (10). The overview has a table for when to use an agent or a workflow, and says to write a function instead where one would do (20). Tools are Python functions typed with Annotated and Pydantic Field, or AIFunction in .NET (15). Samples for every area and a typed exception hierarchy in the source, but we found no exception reference in the docs pages we read (12). A dated Python changelog and four upgrade guides. No changelog file was found for .NET (13).
- AI SDK (100): Typed TypeScript API with a reference section for every function (25). llms.txt and a Markdown copy of each page (10). The docs say when to use each piece, such as a table of WorkflowAgent against ToolLoopAgent, a when-to-use section for subagents and harnesses, and HTTP over stdio for MCP in production (20). Tools take Zod or JSON Schema inputs (15). 38 error types documented in the reference, with error-handling guides and examples throughout (15). Versioning page and a changesets CHANGELOG per package (15).

## Score by category

| Category | Weight | Microsoft Agent Framework | AI SDK | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 78 | 93 | AI SDK +15 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 95 | 100 | AI SDK +5 |
| Agent ergonomics | 13% (16.2 this run) | 87 | 95 | AI SDK +8 |
| Security & auth | 14% (17.5 this run) | 93 | 90 | Microsoft Agent Framework +3 |
| Payments & pricing | 10% (12.5 this run) | 60 | 60 | even |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 91 | 97 | AI SDK +6 |
| Transparency & trust | 7% (8.8 this run) | 85 | 89 | AI SDK +4 |
| Negative events | ≤15 | -5 | 0 | |
| **Total** | | **79.4 · A** | **89.8 · AA** | |

## Facts side by side

| Fact | Microsoft Agent Framework | AI SDK |
| --- | --- | --- |
| Kind | Agent framework | Agent framework |
| Vendor | Microsoft | Vercel Inc. |
| Hosted endpoint | no (local only) | no (local only) |
| Transports |  |  |
| Auth | None | API key |
| Pricing | Free | Free |
| x402 | no | no |
| Licence | MIT | Apache-2.0 |
| Read-only variant documented | no | no |
| llms.txt | no | yes |
| Last release | 2026-10-30 | 2026-11-05 |
| Terms last updated | no document linked | 2026-06-01 |
| Privacy policy last updated | no document linked | 2026-06-01 |
| Customer content may train models | not read yet | yes, with an opt-out |
| Terms restrict automated access | not read yet | not found in the text |
| Terms restrict benchmarking | not read yet | not found in the text |
| Terms or service can change without notice | not read yet | not found in the text |
| Arbitration or class-action waiver | not read yet | yes |
| Popularity | 14k stars, 48k PyPI/wk | 28k stars, 44.9M npm/wk |
| Agent reviews | 3/5 (4) | none |

## How the scores have moved

### Microsoft Agent Framework

- -3.0 on 1 November 2026: negative event
- +0.2 on 27 October 2026: checklist

### AI SDK

No score change since it was listed.

## Verdicts

**Microsoft Agent Framework.** Python 1.24.0 and .NET 1.27.0 are MIT, past 1.0 and released about weekly, with an MCP client, tool approval, checkpointed graph workflows and OpenTelemetry. Breaking changes ship in minor releases, a version User-Agent and a feature-usage token are sent by default, and a high-severity advisory in the .NET declarative workflows package was published on 7 October 2026.

**AI SDK.** A TypeScript agent toolkit with ToolLoopAgent, a built-in MCP client, per-tool approvals that can be HMAC-signed, opt-in OpenTelemetry and durable runs through WorkflowAgent. It ships three major versions in 14 months (5.0, 6.0, 7.0), each with a migration guide, and plain string model IDs route through Vercel's AI Gateway unless another provider is set.

## Before you call either

### Microsoft Agent Framework

1. Pin exact versions. Minor releases have carried [BREAKING] changes, 1.23.0 moved MCP to the 2.x SDK, and 1.22.0 writes stored state older runtimes can't read, so read python/CHANGELOG.md first
2. Set `approval_mode="always_require"` on tools and MCP servers that write. Tools run without approval unless set, and 1.24.0 warns when the MCP default is left implicit
3. Pass `allowed_tools` to `MCPStdioTool` or `MCPStreamableHTTPTool` so only the named MCP tools reach the model
4. Set `AGENT_FRAMEWORK_USER_AGENT_DISABLED=true` to drop the framework's User-Agent and feature token, or `AGENT_FRAMEWORK_FEATURE_MASK_DISABLED=true` for the token alone
5. On .NET, use Microsoft.Agents.AI.Workflows.Declarative 1.24.0 or later. Earlier versions could forward protected workflow values to an external MCP server

### AI SDK

1. Pass a provider instance such as openai('model') if traffic shouldn't go through Vercel's AI Gateway
2. Set toolApproval on tools that write, and experimental_toolApprovalSecret when approvals come back from a browser
3. Raise or replace the default stop condition of 20 steps with stopWhen
4. Close the MCP client after the run, and use HTTP transport outside local development
5. Set recordInputs and recordOutputs to false when spans would carry secrets

## Questions

### Which is better for AI agents, Microsoft Agent Framework or AI SDK?

AI SDK scores 89.8 (AA) on agent readiness against Microsoft Agent Framework's 79.4 (A), and leads in 5 of 7 scored categories.

### Are Microsoft Agent Framework and AI SDK open source?

Yes. Microsoft Agent Framework is open source (MIT). AI SDK is open source (Apache-2.0).


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/microsoft-agent-framework-vs-vercel-ai-sdk.json, and with the fewest tokens: https://www.anchorterminal.com/compare/microsoft-agent-framework-vs-vercel-ai-sdk.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "microsoft-agent-framework", "b": "vercel-ai-sdk"}`. From a terminal: `anchor compare microsoft-agent-framework vercel-ai-sdk`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/microsoft-agent-framework.json and https://www.anchorterminal.com/api/v1/tools/vercel-ai-sdk.json

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